Apparatus for making white lead.



L. V. BARTON & W. P. THOMPSON.

APPARATUS FOR MAKING WHITE LEAD.

APPLICATION FILED JAN.3. I914.

1,152,693. Patented Sept. 7, 1915.

33551 EYE lie the still at LIONEL VINCENTBARTGN AND WILLIAM PHILLIPSTHOMPSON, OF LIVERPOOL ENGLAND. I

APPARATUS FOR MAKING WHITE LEAD.

menses,

Specification of Letters Patent.

Patented Sept. 7, 1915.

Application filed January 3, 1914. Serial No. 810,207.

ments in Apparatus for Making White Lead, of which the following is aspecification. 4

In Bartons patent, No. 988963, a process and apparatus are set forth formaking a very fine pure and non fused monoxid of lead. i The presentinvention is designed for making white lead from such oXid.

Referring to the drawings:l igure l is a Vertical section of ourapparatus; Fig. 2 and Fig. 3, plans of two of the diaphrag'ms.

In these, A is a cylindrical chamber, having a series of diaphragms C,and a conical bottom 1)..

E, E are a series of stirrers carried by; a shaft G, a stirrer beingarranged a slight distance above each diaphragm and one being placed inthe upper part of the conical v bottom-D and extending nearly to thesides thereof. Shaft Gr is vturned by any desired meanssuch as bevelgear B. 0 Hare a series of pet-cocks, of which there'can be any number,for examining the contents of the cylinder.

T, I are scraper holes or hand holes covered with a plate, one or moreabove each diaphragm, whereby the various diaphragms can be scraped fromthe outside if required. J is the entrance for carbonic acid, K a

blow-off cock, and L a step bearing for the shaft.

N is an exit for gases, P an exit for basic carbonate of lead and water,and R a pipe or opening through which the'oxid of lead and water areintroduced. 1 T, T'designate holes in the diaphragms.

The mode of action isas follows :The Barton oxid of lead and water,.witha small percentage of acetic acid or acetate of lead or other like wellknown catalyte for the purposes of carbonati'ng lead is passed into R,carbonic acid is passed through at J, and the stirrers are rotated. Thelarge bottom stirrer causes an agitation at the bottom, and the variousother stirrers keep up this agitation all theway up to the 455 top,While the constant 'or regulatedinflow 'trifugal action yet of materialcauses an upward current through the apparatus. The diaphragms havenumerous holes, especially large ones alternately on each side of theapparatus,

and as shown have a central orifice in three.

instances. The object of the holes at opposite sides alternately is tocause the main currentto traverse from side to side of the apparatusbefore it can escape, instead of ris ing vertically. The oxid of leadbeing much heavier than basic carbonate, tends to fall to the bottom,but is continually stirred up by the large stirrers E, E. As it iscarbonated, it rises through the devious passage caused by thediaphragms or obstructions, while any lumps or fine particles of oxidwhich rise with it pass back through the circumferential holes, and thesmaller perforations. The basic carbonate'with the water finally escapesout the neutral gases with the carbonic opening N.

In thus describing our invention, we do not bind ourselves at all toconical diaphragms. The diaphragms are preferably which are usuallymixed acid, escape out at the conical, so as to prevent deposits, nor dowe to the exact number or arrangement shown, the main object of theinvention being to give a very long cir cuitousipassag'e from the bottomof the still to the top, and vigorously agitate it during the entirepassage, the stirrers creating cenallowing the subsidence of anymetallic lead or oxid thus separated which may be uncarbonated, thewhole apparatus taking up a very small space 1 We declare that what weclaim is 1. In an apparatus for making white lead, the combination of acylindrical chamber having a substantially vertical axis; a seriesconfine ourselves of diaphragms having large perforations at the sides;means for passing carbonic acid, oxid of lead, water and a catalyte intothe chamber near the bottom thereof; means for causing a rapid rotarycurrent in the chamber; means for letting the waste gases, if any,escape at the top; and an exit pipe near the top for water and whitelead.

2. In an apparatus for making white lead, the combination of a chamberhaving a substantially vertical axis; a series of conical, perforateddiaphragms, each with, one or more largepassages or openings notcoinciding vertically with the principal holes in at the opening P,while catalyte into the chamber near means for passing lead, water and athe bottom for causing a rapid rotary current in the chamber; means'forletting the waste gases, if any, escape at the top; and an exit pipenear the top for water and white lead. 4

' 3. In an apparatus for making white lead from oxid of lead, water,carbonic acid, and a catalyte, a chamber round in cross section; aseries of conical diaphragmsplaced with their convex face uppermost;with means for causing a rapid circulation of the material; and meansfor tions of the material to fall at the side to which it is carried bythe centrifugal action set up in the apparatus.

4:. In an apparatus for making white lead from oxid of lead, water,carbonic acid and a catalyte, a chamber round in cross-section having aconical bottom and a blow-off cock; a series of perforated diaphragmsconical in form and placed-with their convex face uppermost; a centralshaft; and a stirrer attached thereto alittle above each of thediaphragms. 4

adjacent diaphragms; carbonic acid, oxid of thereof means I 5. In anapparatus for making white lead from oxid of lead, water, carbonic acidand a catalyte, a chamber round 1n cross-section;

allowing the heavy por-- a conical bottom in the upper portion of theconical bottom and extending nearly to the sides of the same; and meansfor rotating the shaft so as to cause a vigorous circulation of the ma:-terial being treated.

(5. In apparatus for making white lead from oxid of lead, water,carbonic acid and a catalyte, the combination of a vertical cylinderhaving a settling space in the bottom thereof; a-series of diaphragmsconical in form, with their convex face uppermost and each havingperforations at the side and also other perforations near the centerthereof; a device for causing rotary motion in the contents throughoutthe cylinder except at the bottom thereof; and a cock for drawing offsediment, from time to time, from the bottom of the settling space in Inwitness whereof, we have hereunto signed our names this 24th day ofDecember,

the cylinder.

for said chamber; a stirrer 1913,in the presence of two subscribingwitnesses.

norm VINCENT BARTON. WILLIAM PHILLIPS THOMPSON.

